Rekordbox doesn't recognize my DDJ-400 and MIDI Studio is not working.

Hello! I just bought it DDJ-400 with DM-40.

I downloaded latest version of rekordbox and jack in my ddj-400 and my laptop, same as dm-40.

I have nothing with speakers but controller just not working. I literally did everything what had been written and it just didn't work. I opened MIDI setting and i can't select my connected DDJ-400.

I also tried to add, import, export. Somehow it didn't work either. Afterwards I downloaded Virtual DJ and it instantly recognized my controller. But I haven't full version of it so I prefer rekordbox =) I'm looking for your help!

I use windows 7, laptop.